| 摘要 |
PCT No. PCT/GB96/01899 Sec. 371 Date May 26, 1998 Sec. 102(e) Date May 26, 1998 PCT Filed Aug. 5, 1996 PCT Pub. No. WO97/05985 PCT Pub. Date Feb. 20, 1997A method of manufacturing piston rings from a tube blank includes cutting a longitudinal slot in the tube blank, applying a force to the tube blank so that the slot is at least partially closed and the tube has a stressed shape, securing the stressed tube such taht the tube remains in the stressed shape upon removal of the force, laterally slicing the stressed tube to form a plurality of individual stressed shape piston rings, and releasing each of the individual stressed shape piston rings such that each of the piston rings returns to its unstressed shape. |
